PIC18LC658T-ESLASHCL datasheet(41/366 Pages) MICROCHIP

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 2000 Microchip Technology Inc.

Advanced Information

DS30475A-page 41

PIC18CXX8

4.0

MEMORY ORGANIZATION

There are two memory blocks in Enhanced MCU

devices. These memory blocks are:

• Program Memory

• Data Memory

Each block has its own bus so that concurrent access

can occur.

4.1

Program Memory Organization

The PIC18CXX8 devices have a 21-bit program

counter that is capable of addressing the 2 Mbyte

program memory space.

The reset vector address is at 0000h and the interrupt

vector addresses are at 0008h and 0018h. Figure 4-1

shows the diagram for program memory map and stack

for the PIC18C658 and PIC18C858.

4.1.1

INTERNAL PROGRAM MEMORY

OPERATION

All devices have 32 Kbytes of internal EPROM program

memory. This means that the PIC18CXX8 devices can

store up to 16K of single word instructions. Accessing

a location between the physically implemented mem-

ory and the 2 Mbyte address will cause a read of all '0's

(a NOP instruction).

FIGURE 4-1:

PROGRAM MEMORY MAP

AND STACK FOR

PIC18C658/858

PC<20:0>

Stack Level 1

•

Stack Level 31

RESET Vector

Low Priority Interrupt Vector

•

0000h

0018h

8000h

7FFFh

On-chip

Program Memory

High Priority Interrupt Vector 0008h

Read ’1’

1FFFFFh

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